/**
 * Copyright (c) Tiny Technologies, Inc. All rights reserved.
 * Licensed under the LGPL or a commercial license.
 * For LGPL see License.txt in the project root for license information.
 * For commercial licenses see https://www.tiny.cloud/
 */

import { Editor } from 'tinymce/core/api/Editor';
import Tools from 'tinymce/core/api/util/Tools';
import Settings from '../api/Settings';
import { Arr } from '@ephox/katamari';

const isArray = Tools.isArray;

export const UserDefined = 'User Defined';

export type CharMap = {
  name: string,
  characters: [number, string][]
};

const getDefaultCharMap = function (): CharMap[] {
  return [
    // TODO: Merge categories with TBIO
    // {
    //   name: 'Unknown',
    //   characters : [
    //     [160, 'no-break space'],
    //     [173, 'soft hyphen'],
    //     [34, 'quotation mark']
    //   ]
    // },
    { name: 'Currency',
      characters: [
        [36, 'dollar sign'],
        [162, 'cent sign'],
        [8364, 'euro sign'],
        [163, 'pound sign'],
        [165, 'yen sign'],
        [164, 'currency sign'],
        [8352, 'euro-currency sign'],
        [8353, 'colon sign'],
        [8354, 'cruzeiro sign'],
        [8355, 'french franc sign'],
        [8356, 'lira sign'],
        [8357, 'mill sign'],
        [8358, 'naira sign'],
        [8359, 'peseta sign'],
        [8360, 'rupee sign'],
        [8361, 'won sign'],
        [8362, 'new sheqel sign'],
        [8363, 'dong sign'],
        [8365, 'kip sign'],
        [8366, 'tugrik sign'],
        [8367, 'drachma sign'],
        [8368, 'german penny symbol'],
        [8369, 'peso sign'],
        [8370, 'guarani sign'],
        [8371, 'austral sign'],
        [8372, 'hryvnia sign'],
        [8373, 'cedi sign'],
        [8374, 'livre tournois sign'],
        [8375, 'spesmilo sign'],
        [8376, 'tenge sign'],
        [8377, 'indian rupee sign'],
        [8378, 'turkish lira sign'],
        [8379, 'nordic mark sign'],
        [8380, 'manat sign'],
        [8381, 'ruble sign'],
        [20870, 'yen character'],
        [20803, 'yuan character'],
        [22291, 'yuan character, in hong kong and taiwan'],
        [22278, 'yen/yuan character variant one']
      ]
    },
    { name: 'Text',
      characters: [
        [169, 'copyright sign'],
        [174, 'registered sign'],
        [8482, 'trade mark sign'],
        [8240, 'per mille sign'],
        [181, 'micro sign'],
        [183, 'middle dot'],
        [8226, 'bullet'],
        [8230, 'three dot leader'],
        [8242, 'minutes / feet'],
        [8243, 'seconds / inches'],
        [167, 'section sign'],
        [182, 'paragraph sign'],
        [223, 'sharp s / ess-zed']
      ]
    },
    { name: 'Quotations',
      characters: [
        [8249, 'single left-pointing angle quotation mark'],
        [8250, 'single right-pointing angle quotation mark'],
        [171, 'left pointing guillemet'],
        [187, 'right pointing guillemet'],
        [8216, 'left single quotation mark'],
        [8217, 'right single quotation mark'],
        [8220, 'left double quotation mark'],
        [8221, 'right double quotation mark'],
        [8218, 'single low-9 quotation mark'],
        [8222, 'double low-9 quotation mark'],
        [60, 'less-than sign'],
        [62, 'greater-than sign'],
        [8804, 'less-than or equal to'],
        [8805, 'greater-than or equal to'],
        [8211, 'en dash'],
        [8212, 'em dash'],
        [175, 'macron'],
        [8254, 'overline'],
        [164, 'currency sign'],
        [166, 'broken bar'],
        [168, 'diaeresis'],
        [161, 'inverted exclamation mark'],
        [191, 'turned question mark'],
        [710, 'circumflex accent'],
        [732, 'small tilde'],
        [176, 'degree sign'],
        [8722, 'minus sign'],
        [177, 'plus-minus sign'],
        [247, 'division sign'],
        [8260, 'fraction slash'],
        [215, 'multiplication sign'],
        [185, 'superscript one'],
        [178, 'superscript two'],
        [179, 'superscript three'],
        [188, 'fraction one quarter'],
        [189, 'fraction one half'],
        [190, 'fraction three quarters']
      ]
    },
    {
      name: 'Mathematical',
      characters: [
        [402, 'function / florin'],
        [8747, 'integral'],
        [8721, 'n-ary sumation'],
        [8734, 'infinity'],
        [8730, 'square root'],
        [8764, 'similar to'],
        [8773, 'approximately equal to'],
        [8776, 'almost equal to'],
        [8800, 'not equal to'],
        [8801, 'identical to'],
        [8712, 'element of'],
        [8713, 'not an element of'],
        [8715, 'contains as member'],
        [8719, 'n-ary product'],
        [8743, 'logical and'],
        [8744, 'logical or'],
        [172, 'not sign'],
        [8745, 'intersection'],
        [8746, 'union'],
        [8706, 'partial differential'],
        [8704, 'for all'],
        [8707, 'there exists'],
        [8709, 'diameter'],
        [8711, 'backward difference'],
        [8727, 'asterisk operator'],
        [8733, 'proportional to'],
        [8736, 'angle']
      ]
    },
    // TODO: Merge categories with TBIO
    // {
    //   name: 'Undefined',
    //   characters: [
    //     [180, 'acute accent'],
    //     [184, 'cedilla'],
    //     [170, 'feminine ordinal indicator'],
    //     [186, 'masculine ordinal indicator'],
    //     [8224, 'dagger'],
    //     [8225, 'double dagger']
    //   ]
    // },
    {
      name: 'Extended Latin',
      characters: [
        [192, 'A - grave'],
        [193, 'A - acute'],
        [194, 'A - circumflex'],
        [195, 'A - tilde'],
        [196, 'A - diaeresis'],
        [197, 'A - ring above'],
        [256, 'A - macron'],
        [198, 'ligature AE'],
        [199, 'C - cedilla'],
        [200, 'E - grave'],
        [201, 'E - acute'],
        [202, 'E - circumflex'],
        [203, 'E - diaeresis'],
        [274, 'E - macron'],
        [204, 'I - grave'],
        [205, 'I - acute'],
        [206, 'I - circumflex'],
        [207, 'I - diaeresis'],
        [298, 'I - macron'],
        [208, 'ETH'],
        [209, 'N - tilde'],
        [210, 'O - grave'],
        [211, 'O - acute'],
        [212, 'O - circumflex'],
        [213, 'O - tilde'],
        [214, 'O - diaeresis'],
        [216, 'O - slash'],
        [332, 'O - macron'],
        [338, 'ligature OE'],
        [352, 'S - caron'],
        [217, 'U - grave'],
        [218, 'U - acute'],
        [219, 'U - circumflex'],
        [220, 'U - diaeresis'],
        [362, 'U - macron'],
        [221, 'Y - acute'],
        [376, 'Y - diaeresis'],
        [562, 'Y - macron'],
        [222, 'THORN'],
        [224, 'a - grave'],
        [225, 'a - acute'],
        [226, 'a - circumflex'],
        [227, 'a - tilde'],
        [228, 'a - diaeresis'],
        [229, 'a - ring above'],
        [257, 'a - macron'],
        [230, 'ligature ae'],
        [231, 'c - cedilla'],
        [232, 'e - grave'],
        [233, 'e - acute'],
        [234, 'e - circumflex'],
        [235, 'e - diaeresis'],
        [275, 'e - macron'],
        [236, 'i - grave'],
        [237, 'i - acute'],
        [238, 'i - circumflex'],
        [239, 'i - diaeresis'],
        [299, 'i - macron'],
        [240, 'eth'],
        [241, 'n - tilde'],
        [242, 'o - grave'],
        [243, 'o - acute'],
        [244, 'o - circumflex'],
        [245, 'o - tilde'],
        [246, 'o - diaeresis'],
        [248, 'o slash'],
        [333, 'o macron'],
        [339, 'ligature oe'],
        [353, 's - caron'],
        [249, 'u - grave'],
        [250, 'u - acute'],
        [251, 'u - circumflex'],
        [252, 'u - diaeresis'],
        [363, 'u - macron'],
        [253, 'y - acute'],
        [254, 'thorn'],
        [255, 'y - diaeresis'],
        [563, 'y - macron'],
        [913, 'Alpha'],
        [914, 'Beta'],
        [915, 'Gamma'],
        [916, 'Delta'],
        [917, 'Epsilon'],
        [918, 'Zeta'],
        [919, 'Eta'],
        [920, 'Theta'],
        [921, 'Iota'],
        [922, 'Kappa'],
        [923, 'Lambda'],
        [924, 'Mu'],
        [925, 'Nu'],
        [926, 'Xi'],
        [927, 'Omicron'],
        [928, 'Pi'],
        [929, 'Rho'],
        [931, 'Sigma'],
        [932, 'Tau'],
        [933, 'Upsilon'],
        [934, 'Phi'],
        [935, 'Chi'],
        [936, 'Psi'],
        [937, 'Omega'],
        [945, 'alpha'],
        [946, 'beta'],
        [947, 'gamma'],
        [948, 'delta'],
        [949, 'epsilon'],
        [950, 'zeta'],
        [951, 'eta'],
        [952, 'theta'],
        [953, 'iota'],
        [954, 'kappa'],
        [955, 'lambda'],
        [956, 'mu'],
        [957, 'nu'],
        [958, 'xi'],
        [959, 'omicron'],
        [960, 'pi'],
        [961, 'rho'],
        [962, 'final sigma'],
        [963, 'sigma'],
        [964, 'tau'],
        [965, 'upsilon'],
        [966, 'phi'],
        [967, 'chi'],
        [968, 'psi'],
        [969, 'omega']
      ]
    },
    {
      name: 'Symbols',
      characters: [
        [8501, 'alef symbol'],
        [982, 'pi symbol'],
        [8476, 'real part symbol'],
        [978, 'upsilon - hook symbol'],
        [8472, 'Weierstrass p'],
        [8465, 'imaginary part']
      ]
    },
    {
      name: 'Arrows',
      characters: [
        [8592, 'leftwards arrow'],
        [8593, 'upwards arrow'],
        [8594, 'rightwards arrow'],
        [8595, 'downwards arrow'],
        [8596, 'left right arrow'],
        [8629, 'carriage return'],
        [8656, 'leftwards double arrow'],
        [8657, 'upwards double arrow'],
        [8658, 'rightwards double arrow'],
        [8659, 'downwards double arrow'],
        [8660, 'left right double arrow'],
        [8756, 'therefore'],
        [8834, 'subset of'],
        [8835, 'superset of'],
        [8836, 'not a subset of'],
        [8838, 'subset of or equal to'],
        [8839, 'superset of or equal to'],
        [8853, 'circled plus'],
        [8855, 'circled times'],
        [8869, 'perpendicular'],
        [8901, 'dot operator'],
        [8968, 'left ceiling'],
        [8969, 'right ceiling'],
        [8970, 'left floor'],
        [8971, 'right floor'],
        [9001, 'left-pointing angle bracket'],
        [9002, 'right-pointing angle bracket'],
        [9674, 'lozenge'],
        [9824, 'black spade suit'],
        [9827, 'black club suit'],
        [9829, 'black heart suit'],
        [9830, 'black diamond suit'],
        [8194, 'en space'],
        [8195, 'em space'],
        [8201, 'thin space'],
        [8204, 'zero width non-joiner'],
        [8205, 'zero width joiner'],
        [8206, 'left-to-right mark'],
        [8207, 'right-to-left mark']
      ]
    }
  ];
};

const charmapFilter = function (charmap) {
  return Tools.grep(charmap, function (item) {
    return isArray(item) && item.length === 2;
  });
};

const getCharsFromSetting = function (settingValue) {
  if (isArray(settingValue)) {
    return [].concat(charmapFilter(settingValue));
  }

  if (typeof settingValue === 'function') {
    return settingValue();
  }

  return [];
};

const extendCharMap = function (editor: Editor, charmap: CharMap[]) {
  const userCharMap = Settings.getCharMap(editor);
  if (userCharMap) {
    charmap = [{name: UserDefined, characters: getCharsFromSetting(userCharMap)}];
  }

  const userCharMapAppend = Settings.getCharMapAppend(editor);
  if (userCharMapAppend) {
    const userDefinedGroup = Tools.grep(charmap, (cg) => cg.name === UserDefined);
    if (userDefinedGroup.length) {
      userDefinedGroup[0].characters = [].concat(userDefinedGroup[0].characters).concat(getCharsFromSetting(userCharMapAppend));
      return charmap;
    }
    return [].concat(charmap).concat({name: UserDefined, characters: getCharsFromSetting(userCharMapAppend)});
  }

  return charmap;
};

const getCharMap = function (editor: Editor): CharMap[] {
  const groups = extendCharMap(editor, getDefaultCharMap());
  return groups.length > 1 ? [
    {
      name: 'All',
      characters: Arr.bind(groups, (g) => g.characters)
    }
  ].concat(groups) : groups;
};

export default {
  getCharMap
};